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I used to grow them in Perth Western Australia which is another hot and dry place in the summer. All teh moisture come via the substrate. I never had problems. Alternatively if you look at the cluster im holding in the elm oyster thread - that came off shallow buried logs. The shrooms will fruit when it rains- id does rain there doesnt it? eventually?
If you did why not make a mini humidifier with a bin or tub with some perlite on the bottom and an open top The evaporation might keep humidity over the ambient and yet because its open air exchange is good